2009/9/16 Michael Foord <fuzzyman at voidspace.org.uk>: > Georg Brandl wrote: >> >> May I have a short vote on this issue: >> >> http://bugs.python.org/issue6903 >> >> In short, pdb (since 2.6) uses a separate displayhook in order to avoid >> _ being reassigned (which screws up debugging apps that use _ as gettext). >> In that displayhook, I did not add the suppression of printing None, as >> it can be confusing to look at variables and get no output: >> >> (Pdb) foo >> 1 >> (Pdb) bar >> (Pdb) >> >> (You could argue that this is what the "p" command is for though.) >> >> Now in Python 3, where print is a function, if you call print in a loop >> (e.g. to debug a list or dictionary, as it is advertised in the pdb docs >> under the "alias" command), the output has the printed values interspersed >> with "None"s. >> >> Now, what is the lesser evil? >> >> > > IMO not showing the extraneous Nones is preferable. I agree (although I don't use pdb, so my view shouldn't be given too much weight...) Paul.
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